add link to a mentioned example (#2709)

docs/network/edges.html

@@ -935,7 +935,7 @@ var options: {
             <td>String</td>
             <td><code>'dynamic'</code></td>
             <td>Possible options: <code>'dynamic', 'continuous', 'discrete', 'diagonalCross', 'straightCross', 'horizontal',
-                'vertical', 'curvedCW', 'curvedCCW', 'cubicBezier'</code>. Take a look at our example 26 to see what these look like
+                'vertical', 'curvedCW', 'curvedCCW', 'cubicBezier'</code>. Take a look at <a href="http://visjs.org/examples/network/edgeStyles/smooth.html">this example</a> to see what these look like
                 and pick the one that you like best!
                 <br><br>
                 When using dynamic, the edges will have an invisible support node guiding the shape. This node is part of the